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  1. 27-12-2020 #1
    Doddy's Avatar
    Lives in Preston, United Kingdom.
    Doddy
    Last Activity: 4 Days Ago Has been a member for 9-10 years. Has a total post count of 1,364. Received thanks 188 times, giving thanks to others 66 times. Referred 1 members to the community.
    I'm inclined to agree with Jazz on this one...

    From this image...,

    Click image for larger version.  Name: Screenshot 2020-12-27 at 19.33.36.png  Views: 505  Size: 3.96 MB  ID: 29289

    The "10V" terminal looks to be the (input) supply to a charge-pump (simple RC) circuit, with the cap discharged through the switching of the local opto-isolator. There's a trace through a transistor that drives the AVI signal. My bet - this speed control is electrically isolated from the rest of the main board, and the ACM (gnd) AVI (0-10V output) - connect to the Spindle controller AVI (input) and 10V (*** INPUT TO THE BOARD ***) which needs to be connected to the 10V reference on the spindle controller.
    Last edited by Doddy; 27-12-2020 at 08:53 PM.
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